JPH0317099Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] Industrial field of application The present invention relates to a mechanism for attaching a bellows-like diaphragm used as a bellows-like diaphragm for a pump or other valve device.

BACKGROUND ART Conventionally, in a device that links the operation of a piston in a cylinder with the expansion and contraction of a bellows-like diaphragm, a bellows-like diaphragm 2 is attached to a main body 3, as shown in FIG. 3 and the bottom of cylinder 4. However, when the bellows-like diaphragm is installed, for example in FIG. Problems that the invention aims to solve: ``In particular, the valve body contracts and expands depending on the temperature of the fluid flowing through the valve, and this distortion sometimes causes fluid leakage.'' Problems that the invention aims to solve: The object of the present invention is to provide a mechanism for fixing bellows-like diaphragms of pumps, valves, etc., which can absorb distortions such as fluid leakage due to hydraulic pressure and contraction and expansion due to fluid temperature.

[Structure of the invention]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a pump, a valve, etc. in which the operation of a piston in a cylinder is linked to the expansion and contraction movement of a bellows-like diaphragm, and is provided at the inner periphery of the upper part 20a of the main body 20. An L-shaped groove 25 is provided at the bottom of the cylinder 12, and a protrusion 12b that fits into the groove 25 is provided at the bottom of the cylinder 12, and a gasket 26a is fitted in the groove 30 formed by surrounding the corner of the protrusion 12b. Inset, bellows-like diaphragm 21
A thick flange 21 bent outward on the upper edge of a.
b, and the flange 21b is connected to the L-shaped groove 25.
An O-ring 26b is interposed between the outer peripheral end surface of the flange 21b and the vertical wall 25b of the L-shaped groove 25, and the packing 26a
on the flange 21b, and attach the cylinder head 1
1. It has a diaphragm fixing mechanism for pumps, valves, etc., characterized in that the flange 21b of the bellows-like diaphragm 21a and the packing 26a are fixed together by tightening the cylinder 12 and the main body 20 with bolts. The following is a detailed description of the embodiment shown in the drawings.

In FIG. 1, reference numeral 12 denotes a cylinder, which has a concave vertical cross-section, into which a piston 13 is fitted so as to be able to slide up and down, and a cylinder head 11 is fixed to the open top of the cylinder 12 with a lid. A coiled spring 15 is fitted into a spring support slot 11a provided on the back surface of the cylinder head 11 and a spring support slot 13a provided on the top surface of the piston 13 to constantly press the piston 13 downward. . The cylinder head 11 also has an operating air inlet 1 that communicates with the inside of the cylinder 12.
4 is provided. The piston 13 is also provided with an air passage hole 16 that communicates with the operating air inlet 14 and sends operating air to the back side of the piston. The upper part 20a of the valve 20 is connected to the lower part of the cylinder 12. Spindle 1 attached to the bottom surface of piston 13 with bolt 17
8 penetrates the bottom surface 12a of the cylinder 12 and projects into the valve 20, and the body 22 of the bellows-like diaphragm 21a is fixed to the tip thereof by means such as screwing. The body 22 of the bellows-like diaphragm 21a is constantly pressed by the pressure of the coil spring 15 against valve seats 24, 24 provided in a fluid passage 23 that communicates laterally within the pump or valve.

Flange 21b at the upper edge of the bellows-like diaphragm 21a
The installation of the valve 20 to the valve 20 is as follows.

An L-shaped step groove 2 is formed on the inner periphery of the upper part 20a of the main body 20.
5, a protrusion 12b that fits into the step groove 25 is provided at the lower part of the cylinder 12, and a groove 30 formed by surrounding the lower corner of the protrusion 12b is made of a material such as fluorine rubber. Patsukin 26
are fitted and fixed by adhesive or other means. Further, a thick flange 21b bent outward approximately horizontally is formed on the upper edge of the bellows-like diaphragm 21a.
An O-ring 26b is interposed between the outer peripheral end surface of b and the vertical wall 25 of the L-shaped step groove 25.

FIGS. 1 and 2 show an O-ring fitting groove 2 in the outer peripheral end surface of the flange 21b on the upper edge of the bellows-like diaphragm 21a.
1c, and fit an O-ring 26b into it, overlap the thick flange 21b at the upper edge of the diaphragm 21a on the horizontal part 25a of the L-shaped step groove 25, and bring the O-ring 26b into contact with the vertical part 25b for a seal. At the same time, the gasket 26a attached to the groove 30 surrounding the lower corner of the protrusion 12b of the cylinder 12 is inserted into the thick flange 21b of the diaphragm 21a.
stack on top, cylinder head 11, cylinder 1
2. The diaphragm 21a is tightened and fixed by the bolt 31 passing through the valve body 20.
FIG. 3 shows an embodiment in which a thick flange 21b and a packing 26a are clamped and sealed together, and FIG. This shows an embodiment in which the O-ring 26b and the end face of the flange 21b are brought into contact. 35 is a cap.

In either of the embodiments of the valve shown in FIGS. 2 and 3, when air is forced into the operating air inlet 14 provided in the cylinder head 11, the air passes through the air passage hole 16 to the lower surface of the piston 13 and the bottom of the cylinder 12. It is fed into the gap 32 between. When the air pressure pushes the piston 13 upward against the repulsive force of the coil spring 15, the spindle 18 attached to the piston 13 in a hanging manner also rises. Therefore, the body 22 of the bellows-like diaphragm 21a is separated from the valve seats 24, 24 [i.e., the body 22 is opened] and the fluid passage 23 of the body 20,
Fluid passes through 23 from A to B direction.

Effect: When the fluid passes from A to B direction, the fluid flows in the C direction, that is, into the gap between the outer surface of the bellows-like diaphragm 21a and the upper inner side of the main body, and flows out from the connection between the cylinder 12 and the main body 20. try to.
However, in the present invention, the bellows-like diaphragm 21
O-ring 26 provided on the outer periphery of flange 21b of a
b is sealed to the vertical wall 25b of the L-shaped step groove 25 in the upper part 20a of the main body 20, so there is no fluid leakage, and when the fluid passing through the flow path 23 of the main body 20 is heated, the main body does not contract or expand. This also causes liquid leakage, but the presence of the packing 26a, that is, its cushioning properties, absorbs the distortion caused by contraction, expansion, etc., and prevents liquid leakage.

〔effect〕

As described above, the present invention is a pump and valve that can not only prevent fluid leakage due to hydraulic pressure, but also absorb distortions such as contraction and expansion caused by fluid temperature to prevent fluid leakage. This has the effect of providing a diaphragm fixing mechanism such as the above.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the invention, Fig. 2 is an enlarged sectional view of a part of Fig. 1, and Fig. 3 shows another embodiment. FIG. 4 is a partially enlarged longitudinal sectional view of a bellows mounting mechanism in a known valve device. DESCRIPTION OF SYMBOLS 11...Cylinder head, 12...Cylinder, 12b...Protrusion part, 20...Valve body, 2
0a... Upper part of the valve body, 21a... Diaphragm, 2
1b...Flange, 25...L-shaped groove, 26a...
...Putskin, 26b...O ring, 30...Shape groove.

Claims (1)

[Scope of utility model registration request] In pumps, valves, etc., in which the operation of a piston in a cylinder is linked to the expansion and contraction movement of a bellows-like diaphragm, an L is attached to the inner periphery of the upper part 20a of the main body 20.
In addition to providing a stepped groove 25, a protruding portion 12b that fits into the stepped groove 25 is provided at the lower part of the cylinder 12, and a packing 26a is fitted into the shaped groove 30 formed by surrounding the corner of the protruding portion 12b. A thick flange 21b bent outward is formed on the upper edge of the bellows-like diaphragm 21a, and the flange 21b is overlapped on the horizontal part 25a of the L-shaped step groove 25, and the outer peripheral end surface of the flange 21b and the L-shaped Standing wall 25b of step groove 25
An O-ring 26b is interposed between the cylinder head 11, the cylinder 12 and the main body 20, and the packing 26a is stacked on the flange 21b.
A diaphragm fixing mechanism for pumps, valves, etc., characterized in that a flange 21b of a bellows-like diaphragm 21a and a packing 26a are fixed together by tightening with bolts.